如何计算matplotlib中散点图标记的大小

Question

Let's say I create a simple matplotlib scatter plot.

How would I then draw the line between the edges of dots on scatter plot? Meaning that the line would start and end on edges of dots?

EDIT: Forgot to add code snippet

import matplotlib.pyplot as plt


plt.scatter([0, 0, 0], [5, 3, 4], s=250)
plt.scatter([3, 3, 3], [5, 3, 4], s=350)

plt.arrow(0, 5, dx=3, dy=0, width=0.01)
plt.arrow(0, 3, dx=3, dy=0, width=0.01)
plt.arrow(0, 4, dx=3, dy=0, width=0.01)
plt.show()

How do I subtract from dx to connect dots only from edges

Answer 1

You could finagle with the sizes of the dots, but this is not how one should approach the problem. A better way would be to draw the dots after one draws the lines, so that the dots are placed on top.

This can be achieved with zorder . In your example, this would look like

import matplotlib.pyplot as plt


plt.scatter([0, 0, 0], [5, 3, 4], s=250, zorder=2)
plt.scatter([3, 3, 3], [5, 3, 4], s=350, zorder=2)

plt.arrow(0, 5, dx=3, dy=0, width=0.01, zorder=1)
plt.arrow(0, 3, dx=3, dy=0, width=0.01, zorder=1)
plt.arrow(0, 4, dx=3, dy=0, width=0.01, zorder=1)
plt.show()

and this produces the plot

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As an aside, you probably also are not looking for arrow if you're only looking to draw lines between points. You are just looking for plot .